On 04/18/2014 05:55 PM, Theodore Ts'o wrote: > On Fri, Apr 18, 2014 at 11:45:35AM +0200, Lukáš Czerner wrote: >> >> I'd like to point out that do_fallocate() in vfs uses ENODEV in the >> case it is not regular file nor directory. >> >> Also I thought of the EOPNOTSUP to be the right way to go. For >> example we do not support it on non-extent based files in ext4 so we >> return EOPNOTSUP. >> >> The same is for the case that we do not support the particular >> fallocate mode. >> >> So I am not really sure about what's the right error to use. > > Yes, there is some inconsistency here. I'll change this particular > case (a non-REGULAR file to use EINVAL) to be consistent with xfs, but > I suspect programs are going to have to be flexible. Okay -- I'll document EINVAL as the (sole) error for this case. Thanks, Ted. > As far as non-extent based files, at least in theory at some point we > could support COLLAPSE_RANGE on regular files, so I'll leave it as > EOPNOTSUPP for now, but the choice is admittedly somewhat arbitrary. Agreed that its somewhat inconsistent, though not as egregiously so as the other case. Cheers, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
